Data transmission method and device in wireless communication system

ABSTRACT

A method and a user equipment (UE) for transmitting control information in a wireless communication system are discussed. The method according to one embodiment includes receiving a parameter which indicates whether transmission of a hybrid automatic repeat request acknowledgement (HARQ-ACK) on a physical uplink control channel (PUCCH) and a sounding reference signal (SRS) in one subframe is configured; if the parameter is true, transmitting, in a primary component carrier (CC), the PUCCH, which coincides in a same subframe as the SRS, by using a shortened PUCCH format carrying at least one of the HARQ-ACK and a positive scheduling request (SR); and if the parameter is false, transmitting the PUCCH by using a normal PUCCH format, while not transmitting, in a secondary CC, the SRS which coincides in the same subframe as the PUCCH. The shortened PUCCH format is a shortened PUCCH format 1/1a/1b or a shortened PUCCH format 3.

CROSS REFERENCE TO RELATED APPLICATIONS

This Application is a Continuation of co-pending U.S. patent applicationSer. No. 14/706,816 filed on May 7, 2015, which is a Continuation ofU.S. patent application Ser. No. 13/578,567 filed on Feb. 27, 2013 (nowU.S. Pat. No. 9,060,376 issued on Jun. 16, 2015), which is filed as theNational Phase of PCT/KR2011/000973 filed on Feb. 14, 2011, which claimsthe benefit under 35 U.S.C. § 119(e) to U.S. Provisional Application No.61/427,484 filed on Dec. 28, 2010, 61/415,747 filed on Nov. 19, 2010,61/415,354 filed on Nov. 19, 2010, 61/415,338 filed on Nov. 18, 2010,61/409,531 filed on Nov. 2, 2010, 61/409,096 filed on Nov. 1, 2010,61/405,184 filed on Oct. 20, 2010, 61/394,360 filed on Oct. 19, 2010,and 61/303,674 filed on Feb. 12, 2010, and under 35 U.S.C. § 119(a) toKorean Patent Application No. 10-2011-0012416 filed on Feb. 11, 2011,all of which are hereby expressly incorporated by reference into thepresent application.

BACKGROUND OF THE INVENTION

Field of the Invention

The present invention relates to wireless communication and, moreparticularly, to a data transmission method and apparatus in a wirelesscommunication system.

Discussion of the Related Art

In wireless communication systems, it is necessary to estimate an uplinkchannel or a downlink channel for the purpose of the transmission andreception of data, the acquisition of system synchronization, and thefeedback of channel information. In wireless communication systemenvironments, fading is generated because of multi-path time latency. Aprocess of restoring a transmit signal by compensating for thedistortion of the signal resulting from a sudden change in theenvironment due to such fading is referred to as channel estimation. Itis also necessary to measure the state of a channel for a cell to whicha user equipment belongs or other cells. To estimate a channel ormeasure the state of a channel, a reference signal (RS) which is knownto both a transmitter and a receiver can be used.

A subcarrier used to transmit the reference signal is referred to as areference signal subcarrier, and a subcarrier used to transmit data isreferred to as a data subcarrier. In an OFDM system, a method ofassigning the reference signal includes a method of assigning thereference signal to all the subcarriers and a method of assigning thereference signal between data subcarriers. The method of assigning thereference signal to all the subcarriers is performed using a signalincluding only the reference signal, such as a preamble signal, in orderto obtain the throughput of channel estimation. If this method is used,the performance of channel estimation can be improved as compared withthe method of assigning the reference signal between data subcarriersbecause the density of reference signals is in general high. However,since the amount of transmitted data is small in the method of assigningthe reference signal to all the subcarriers, the method of assigning thereference signal between data subcarriers is used in order to increasethe amount of transmitted data. If the method of assigning the referencesignal between data subcarriers is used, the performance of channelestimation can be deteriorated because the density of reference signalsis low. Accordingly, the reference signals should be properly arrangedin order to minimize such deterioration.

A receiver can estimate a channel by separating information about areference signal from a received signal because it knows the informationabout a reference signal and can accurately estimate data, transmittedby a transmit stage, by compensating for an estimated channel value.Assuming that the reference signal transmitted by the transmitter is p,channel information experienced by the reference signal duringtransmission is h, thermal noise occurring in the receiver is n, and thesignal received by the receiver is y, it can result in y=h·p+n. Here,since the receiver already knows the reference signal p, it can estimatea channel information value ĥ using Equation 1 in the case in which aLeast Square (LS) method is used.ĥ=y/p=h+n/p=h+{circumflex over (n)}  Equation 1

The accuracy of the channel estimation value ĥ estimated using thereference signal p is determined by the value {circumflex over (n)}. Toaccurately estimate the value h, the value {circumflex over (n)} mustconverge on 0. To this end, the influence of the value {circumflex over(n)} has to be minimized by estimating a channel using a large number ofreference signals. A variety of algorithms for a better channelestimation performance may exist.

An uplink RS may be divided into a demodulation reference signal (DMRS)and a sounding reference signal (SRS). The DMRS is an RS used in channelestimation for demodulating a received signal. The DMRS may be combinedwith the transmission of a PUSCH or a PUCCH. The SRS is an RStransmitted from UE to a BS for uplink scheduling. The BS estimates anuplink channel through a received SRS and uses the estimated uplinkchannel in uplink scheduling.

Meanwhile, a carrier aggregation system means a system which configuresa broadband by aggregating one or more carriers having a smallerbandwidth than a broadband that is a target when a wirelesscommunication system tries to support the broadband. In the carrieraggregation system, UE can transmit or receive one carrier or aplurality of carriers at the same time depending on the capabilities ofthe UE. Transmission technology conventionally used in the carrieraggregation system may be newly defined.

There is a need for a method of transmitting an SRS and data efficientlyin a carrier aggregation system.

SUMMARY OF THE INVENTION

The present invention provides a data transmission method and apparatusin a wireless communication system.

In an aspect, a data transmission method in a wireless communicationsystem is provided. The data transmission method includes transmittinguplink control information (UCI) through a physical uplink controlchannel (PUCCH) resource allocated to a first CC among a plurality ofcomponent carriers (CCs) in a sounding reference signal (SRS) subframe,wherein a second CC among the plurality of CCs in the SRS subframecomprises an SRS single carrier frequency division multiple access(SC-FDMA) symbol reserved for a transmission of an SRS.

The SRS SC-FDMA symbol may be a last SC-FDMA symbol of the SRS subframe.

The PUCCH resource may be allocated based on shortened PUCCH formats1/1a/1b or a shortened PUCCH format 3.

The data transmission method may further include transmitting the SRSthrough the SRS SC-FDMA symbol.

The PUCCH resource may be allocated based on one of normal PUCCH formats1/1a/1b, PUCCH formats 2/2a/2b, and a normal PUCCH format 3.

The SRS may be not transmitted through the SRS SC-FDMA symbol.

The data transmission method may further include transmitting uplinkdata through a physical uplink shared channel (PUSCH) resource allocatedto at least one of the first CC and the second CC.

The PUSCH may be subject to rate matching except the SRS SC-FDMA symbol.

The SRS subframe may be one of a plurality of user equipment(UE)-specific SRS subframes configured by a UE-specific SRS parameter.

The UE-specific SRS parameter may indicate a periodicity and offset ofthe plurality of UE-specific SRS subframes.

The plurality of UE-specific SRS subframes may be a subset of aplurality of cell-specific SRS subframes configured by a cell-specificSRS parameter.

The SRS subframe may be one of a plurality of cell-specific SRSsubframes configured by a cell-specific SRS parameter.

A bandwidth of part of or an entire SRS SC-FDMA symbol may be allocatedto the transmission of the SRS.

The PUCCH resource may be indicated by a radio resource control (RRC)message.

In another aspect, a user equipment in a wireless communication systemis provided. The user equipment includes a radio frequency (RF) unittransmitting uplink control information (UCI) through a physical uplinkcontrol channel (PUCCH) resource allocated to a first CC among aplurality of component carriers (CCs) in a sounding reference signal(SRS) subframe, and a processor connected to the RF unit, wherein asecond CC among the plurality of CCs in the SRS subframe comprises anSRS single carrier frequency division multiple access (SC-FDMA) symbolreserved for a transmission of an SRS.

When an SRS and a PUCCH are configured in a carrier aggregation systemso that they are transmitted at the same time, data can be efficientlytransmitted.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 shows a wireless communication system.

FIG. 2 shows the structure of a radio frame in 3GPP LTE.

FIG. 3 shows an example of a resource grid of a single downlink slot.

FIG. 4 shows the structure of a downlink subframe.

FIG. 5 shows the structure of an uplink subframe.

FIG. 6 shows an example of a transmitter and a receiver which constitutea carrier aggregation system.

FIG. 7 and FIG. 8 are other examples of a transmitter and a receiverwhich constitute a carrier aggregation system.

FIG. 9 shows an example of an asymmetric carrier aggregation system.

FIG. 10 is an example of a process of processing an uplink sharedchannel (UL-SCH) transport channel.

FIGS. 11 to 13 are examples of constructions regarding data transmissionmethods in proposed SRS subframes.

FIGS. 14 to 16 are examples of constructions regarding a datatransmission method in a proposed SRS subframe.

FIGS. 17 to 19 some examples of constructions regarding a datatransmission method in a proposed SRS subframe.

FIG. 20 is an embodiment of the proposed data transmission method.

FIG. 21 is a block diagram of a BS and UE in which the embodiments ofthe present invention are embodied.

DETAILED DESCRIPTION OF THE EMBODIMENTS

The following technique may be used for various wireless communicationsystems such as code division multiple access (CDMA), a frequencydivision multiple access (FDMA), time division multiple access (TDMA),orthogonal frequency division multiple access (OFDMA), singlecarrier-frequency division multiple access (SC-FDMA), and the like. TheCDMA may be implemented as a radio technology such as universalterrestrial radio access (UTRA) or CDMA2000. The TDMA may be implementedas a radio technology such as a global system for mobile communications(GSM)/general packet radio service (GPRS)/enhanced data rates for GSMevolution (EDGE). The OFDMA may be implemented by a radio technologysuch as institute of electrical and electronics engineers (IEEE) 802.11(Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, E-UTRA (evolved UTRA), andthe like. IEEE 802.16m, an evolution of IEEE 802.16e, provides backwardcompatibility with a system based on IEEE 802.16e. The UTRA is part of auniversal mobile telecommunications system (UMTS). 3GPP (3rd generationpartnership project) LTE (long term evolution) is part of an evolvedUMTS (E-UMTS) using the E-UTRA, which employs the OFDMA in downlink andthe SC-FDMA in uplink. LTE-A (advanced) is an evolution of 3GPP LTE.

Hereinafter, for clarification, LTE-A will be largely described, but thetechnical concept of the present invention is not meant to be limitedthereto.

FIG. 1 shows a wireless communication system.

The wireless communication system 10 includes at least one base station(BS) 11. Respective BSs 11 provide a communication service to particulargeographical areas 15 a, 15 b, and 15 c (which are generally calledcells). Each cell may be divided into a plurality of areas (which arecalled sectors). A user equipment (UE) 12 may be fixed or mobile and maybe referred to by other names such as MS (mobile station), MT (mobileterminal), UT (user terminal), SS (subscriber station), wireless device,PDA (personal digital assistant), wireless modem, handheld device. TheBS 11 generally refers to a fixed station that communicates with the UE12 and may be called by other names such as eNB (evolved-NodeB), BTS(base transceiver system), access point (AP), etc.

In general, a UE belongs to one cell, and the cell to which a UE belongsis called a serving cell. A BS providing a communication service to theserving cell is called a serving BS. The wireless communication systemis a cellular system, so a different cell adjacent to the serving cellexists. The different cell adjacent to the serving cell is called aneighbor cell. A BS providing a communication service to the neighborcell is called a neighbor BS. The serving cell and the neighbor cell arerelatively determined based on a UE.

This technique can be used for downlink or uplink. In general, downlinkrefers to communication from the BS 11 to the UE 12, and uplink refersto communication from the UE 12 to the BS 11. In downlink, a transmittermay be part of the BS 11 and a receiver may be part of the UE 12. Inuplink, a transmitter may be part of the UE 12 and a receiver may bepart of the BS 11.

The wireless communication system may be any one of a multiple-inputmultiple-output (MIMO) system, a multiple-input single-output (MISO)system, a single-input single-output (SISO) system, and a single-inputmultiple-output (SIMO) system. The MIMO system uses a plurality oftransmission antennas and a plurality of reception antennas. The MISOsystem uses a plurality of transmission antennas and a single receptionantenna. The SISO system uses a single transmission antenna and a singlereception antenna. The SIMO system uses a single transmission antennaand a plurality of reception antennas. Hereinafter, a transmissionantenna refers to a physical or logical antenna used for transmitting asignal or a stream, and a reception antenna refers to a physical orlogical antenna used for receiving a signal or a stream.

FIG. 2 shows the structure of a radio frame in 3GPP LTE.

It may be referred to Paragraph 5 of “Technical Specification GroupRadio Access Network; Evolved Universal Terrestrial Radio Access(E-UTRA); Physical channels and modulation (Release 8)” to 3GPP (3rdgeneration partnership project) TS 36.211 V8.2.0 (2008-03). Referring toFIG. 2, the radio frame includes 10 subframes, and one subframe includestwo slots. The slots in the radio frame are numbered by #0 to #19. Atime taken for transmitting one subframe is called a transmission timeinterval (TTI). The TTI may be a scheduling unit for a datatransmission. For example, a radio frame may have a length of 10 ms, asubframe may have a length of 1 ms, and a slot may have a length of 0.5ms.

One slot includes a plurality of orthogonal frequency divisionmultiplexing (OFDM) symbols in a time domain and a plurality ofsubcarriers in a frequency domain. Since 3GPP LTE uses OFDMA indownlink, the OFDM symbols are used to express a symbol period. The OFDMsymbols may be called by other names depending on a multiple-accessscheme. For example, when a single carrier frequency division multipleaccess (SC-FDMA) is in use as an uplink multi-access scheme, the OFDMsymbols may be called SC-FDMA symbols. A resource block (RB), a resourceallocation unit, includes a plurality of continuous subcarriers in aslot. The structure of the radio frame is merely an example. Namely, thenumber of subframes included in a radio frame, the number of slotsincluded in a subframe, or the number of OFDM symbols included in a slotmay vary.

3GPP LTE defines that one slot includes seven OFDM symbols in a normalcyclic prefix (CP) and one slot includes six OFDM symbols in an extendedCP.

The wireless communication system may be divided into a frequencydivision duplex (FDD) scheme and a time division duplex (TDD) scheme.According to the FDD scheme, an uplink transmission and a downlinktransmission are made at different frequency bands. According to the TDDscheme, an uplink transmission and a downlink transmission are madeduring different periods of time at the same frequency band. A channelresponse of the TDD scheme is substantially reciprocal. This means thata downlink channel response and an uplink channel response are almostthe same in a given frequency band. Thus, the TDD-based wirelesscommunication system is advantageous in that the downlink channelresponse can be obtained from the uplink channel response. In the TDDscheme, the entire frequency band is time-divided for uplink anddownlink transmissions, so a downlink transmission by the BS and anuplink transmission by the UE can be simultaneously performed. In a TDDsystem in which an uplink transmission and a downlink transmission arediscriminated in units of subframes, the uplink transmission and thedownlink transmission are performed in different subframes.

FIG. 3 shows an example of a resource grid of a single downlink slot.

A downlink slot includes a plurality of OFDM symbols in the time domainand N_(RB) number of resource blocks (RBs) in the frequency domain. TheN_(RB) number of resource blocks included in the downlink slot isdependent upon a downlink transmission bandwidth set in a cell. Forexample, in an LTE system, N_(RB) may be any one of 60 to 110. Oneresource block includes a plurality of subcarriers in the frequencydomain. An uplink slot may have the same structure as that of thedownlink slot.

Each element on the resource grid is called a resource element. Theresource elements on the resource grid can be discriminated by a pair ofindexes (k,l) in the slot. Here, k (k=0, . . . , N_(RB)×12−1) is asubcarrier index in the frequency domain, and l is an OFDM symbol indexin the time domain.

Here, it is illustrated that one resource block includes 7×12 resourceelements made up of seven OFDM symbols in the time domain and twelvesubcarriers in the frequency domain, but the number of OFDM symbols andthe number of subcarriers in the resource block are not limited thereto.The number of OFDM symbols and the number of subcarriers may varydepending on the length of a cyclic prefix (CP), frequency spacing, andthe like. For example, in case of a normal CP, the number of OFDMsymbols is 7, and in case of an extended CP, the number of OFDM symbolsis 6. One of 128, 256, 512, 1024, 1536, and 2048 may be selectively usedas the number of subcarriers in one OFDM symbol.

FIG. 4 shows the structure of a downlink subframe.

A downlink subframe includes two slots in the time domain, and each ofthe slots includes seven OFDM symbols in the normal CP. First three OFDMsymbols (maximum four OFDM symbols with respect to a 1.4 MHz bandwidth)of a first slot in the subframe corresponds to a control region to whichcontrol channels are allocated, and the other remaining OFDM symbolscorrespond to a data region to which a physical downlink shared channel(PDSCH) is allocated.

The PDCCH may carry a transmission format and a resource allocation of adownlink shared channel (DL-SCH), resource allocation information of anuplink shared channel (UL-SCH), paging information on a PCH, systeminformation on a DL-SCH, a resource allocation of an higher layercontrol message such as a random access response transmitted via aPDSCH, a set of transmission power control commands with respect toindividual UEs in a certain UE group, an activation of a voice overInternet protocol (VoIP), and the like. A plurality of PDCCHs may betransmitted in the control region, and a UE can monitor a plurality ofPDCCHs. The PDCCHs are transmitted on one or an aggregation of aplurality of consecutive control channel elements (CCE). The CCE is alogical allocation unit used to provide a coding rate according to thestate of a wireless channel. The CCE corresponds to a plurality ofresource element groups. The format of the PDCCH and an available numberof bits of the PDCCH are determined according to an associative relationbetween the number of the CCEs and a coding rate provided by the CCEs.

The BS determines a PDCCH format according to a DCI to be transmitted tothe UE, and attaches a cyclic redundancy check (CRC) to the DCI. Aunique radio network temporary identifier (RNTI) is masked on the CRCaccording to the owner or the purpose of the PDCCH. In case of a PDCCHfor a particular UE, a unique identifier, e.g., a cell-RNTI (C-RNTI), ofthe UE, may be masked on the CRC. Or, in case of a PDCCH for a pagingmessage, a paging indication identifier, e.g., a paging-RNTI (P-RNTI),may be masked on the CRC. In case of a PDCCH for a system informationblock (SIB), a system information identifier, e.g., a systeminformation-RNTI (SI-RNTI), may be masked on the CRC. In order toindicate a random access response, i.e., a response to a transmission ofa random access preamble of the UE, a random access-RNTI (RA-RNTI) maybe masked on the CRC.

FIG. 5 shows the structure of an uplink subframe.

An uplink subframe may be divided into a control region and a dataregion in the frequency domain. A physical uplink control channel(PUCCH) for transmitting uplink control information is allocated to thecontrol region. A physical uplink shared channel (PUCCH) fortransmitting data is allocated to the data region. If indicated by ahigher layer, the user equipment may support simultaneous transmissionof the PUCCH and the PUSCH.

The PUCCH for one UE is allocated in an RB pair. RBs belonging to the RBpair occupy different subcarriers in each of a 1^(st) slot and a 2^(nd)slot. A frequency occupied by the RBs belonging to the RB pair allocatedto the PUCCH changes at a slot boundary. This is called that the RB pairallocated to the PUCCH is frequency-hopped at a slot boundary. Since theUE transmits UL control information over time through differentsubcarriers, a frequency diversity gain can be obtained. In the figure,m is a location index indicating a logical frequency-domain location ofthe RB pair allocated to the PUCCH in the subframe.

Uplink control information transmitted on the PUCCH may include a HARQACK/NACK, a channel quality indicator (CQI) indicating the state of adownlink channel, a scheduling request (SR) which is an uplink radioresource allocation request, and the like.

The PUSCH is mapped to a uplink shared channel (UL-SCH), a transportchannel. Uplink data transmitted on the PUSCH may be a transport block,a data block for the UL-SCH transmitted during the TTI. The transportblock may be user information. Or, the uplink data may be multiplexeddata. The multiplexed data may be data obtained by multiplexing thetransport block for the UL-SCH and control information. For example,control information multiplexed to data may include a CQI, a precodingmatrix indicator (PMI), an HARQ, a rank indicator (RI), or the like. Orthe uplink data may include only control information.

3GPP LTE-A supports a carrier aggregation system. 3GPP TR 36.815 V9.0.0(2010-3) may be incorporated herein by reference to describe the carrieraggregation system.

The carrier aggregation system implies a system that configures awideband by aggregating one or more carriers having a bandwidth smallerthan that of a target wideband when the wireless communication systemintends to support the wideband. The carrier aggregation system can alsobe referred to as other terms such as a bandwidth aggregation system orthe like. The carrier aggregation system can be divided into acontiguous carrier aggregation system in which carriers are contiguousto each other and a non-contiguous carrier aggregation system in whichcarriers are separated from each other. In the contiguous carrieraggregation system, a guard band may exist between CCs. A CC which is atarget when aggregating one or more CCs can directly use a bandwidththat is used in the legacy system in order to provide backwardcompatibility with the legacy system. For example, a 3GPP LTE system cansupport a bandwidth of 1.4 MHz, 3 MHz, 5 MHz, 10 MHz, 15 MHz, and 20MHz, and a 3GPP LTE-A system can configure a wideband of 20 MHz orhigher by using only the bandwidth of the 3GPP LTE system.Alternatively, the wideband can be configured by defining a newbandwidth without having to directly use the bandwidth of the legacysystem.

In the carrier aggregation system, a UE can transmit or receive one or aplurality of carriers simultaneously according to capacity. An LTE-A UEcan transmit or receive a plurality of carriers simultaneously. An LTErel-8 UE can transmit or receive only one carrier when each of carriersconstituting the carrier aggregation system is compatible with an LTErel-8 system. Therefore, when the number of carriers used in uplink isequal to the number of carriers used in downlink, it is necessary toconfigure such that all CCs are compatible with LTE rel-8.

In order to efficiently use the plurality of carriers, the plurality ofcarriers can be managed in a media access control (MAC). Totransmit/receive the plurality of carriers, a transmitter and a receiverboth have to be able to transmit/receive the plurality of carriers.

FIG. 6 shows an example of a transmitter and a receiver which constitutea carrier aggregation system.

In the transmitter of FIG. 6(a), one MAC transmits and receives data bymanaging and operating all of n carriers. This is also applied to thereceiver of FIG. 6(b). From the perspective of the receiver, onetransport block and one HARQ entity may exist per CC. A UE can bescheduled simultaneously for a plurality of CCs. The carrier aggregationsystem of FIG. 6 can apply both to a contiguous carrier aggregationsystem and a non-contiguous carrier aggregation system. The respectivecarriers managed by one MAC do not have to be contiguous to each other,which results in flexibility in terms of resource management.

FIG. 7 and FIG. 8 are other examples of a transmitter and a receiverwhich constitute a carrier aggregation system.

In the transmitter of FIG. 7(a) and the receiver of FIG. 7(b), one MACmanages only one carrier. That is, the MAC and the carrier are 1:1mapped. In the transmitter of FIG. 8(a) and the receiver of FIG. 8(b), aMAC and a carrier are 1:1 mapped for some carriers, and regarding theremaining carriers, one MAC controls a plurality of CCs. That is,various combinations are possible based on a mapping relation betweenthe MAC and the carrier.

The carrier aggregation system of FIG. 6 to FIG. 8 includes n carriers.The respective carriers may be contiguous to each other or may beseparated from each other. The carrier aggregation system can apply bothto uplink and downlink transmissions. In a TDD system, each carrier isconfigured to be able to perform uplink transmission and downlinktransmission. In an FDD system, a plurality of CCs can be used bydividing them for an uplink usage and a downlink usage. In a typical TDDsystem, the number of CCs used in uplink transmission is equal to thatused in downlink transmission, and each carrier has the same bandwidth.The FDD system can configure an asymmetric carrier aggregation system byallowing the number of carriers and the bandwidth to be differentbetween uplink and downlink transmissions.

FIG. 9 shows an example of an asymmetric carrier aggregation system.

FIG. 9-(a) is an example of a carrier aggregation system in which thenumber of downlink component carriers (CCs) is larger than the number ofUL CCs. Downlink CCs #1 and #2 correspond to an UL CC #1, and DL CCs #2and #4 correspond to an UL CC #2. FIG. 9-(b) is an example of a carrieraggregation system in which the number of DL CCs is larger than thenumber of UL CCs. A DL CC #1 correspond to UL CCs #1 and #2, and a DL CC#2 correspond to UL CCs #2 and #4. Meanwhile, from a viewpoint of UE,there are one transport block and one hybrid automatic repeat request(HARM) entity in each scheduled CC. Each transport block is mapped toone CC only. UE may be mapped to a plurality of CCs at the same time.

In an LTE-A system, there may be a backward-compatible carrier and anon-backward-compatible carrier. The backward-compatible carrier is acarrier capable of accessing the UEs of all LTE releases including LTErel-8 and LTE-A. The backward-compatible carrier may be operated as asingle carrier or may be operated as a CC in a carrier aggregationsystem. The backward-compatible carrier may be always formed of a pairof uplink and downlink in an FDD system. In contrast, thenon-backward-compatible carrier cannot access the UE of a previous LTErelease, but can access only the UEs of an LTE release that defines thenon-backward-compatible carrier. Furthermore, thenon-backward-compatible carrier may be operated as a single carrier ormay be operated as a CC in a carrier aggregation system. Meanwhile, acarrier that cannot be operated as a single carrier, but that isincluded in a carrier aggregation including at least one carrier capableof being operated as a single carrier may be called an extensioncarrier.

Furthermore, in a carrier aggregation system, a type in which one ormore carriers are used may include two types: a cell-specific carrieraggregation system operated by a specific cell or BS and a UE-specificcarrier aggregation system operated by UE. If a cell means onebackward-compatible carrier or one non-backward-compatible carrier, theterm ‘cell-specific’ may be used for one or more carriers which includeone carrier represented by a cell. Furthermore, in the type of a carrieraggregation system in an FDD system, the linkage of uplink and downlinkmay be determined depending on default transmission-reception (Tx-Rx)separation defined in LTE rel-8 or LTE-A.

For example, in LTE rel-8, default Tx-Rx separation is as follows. Inuplink and downlink, a carrier frequency may be allocated within a rangeof 0˜65535 according to an E-UTRA absolute radio frequency channelnumber (EARFCN). In downlink, a relationship between the EARFCN and acarrier frequency of a MHz unit may be represented by F_(DL)=F_(DL) _(_)_(low)+0.1(N_(DL)−N_(Offs-DL)). In uplink, a relationship between theEARFCN and a carrier frequency of a MHz unit may be represented byF_(UL)=F_(UL) _(_) _(low)+0.1(N_(UL)-N_(Offs-UL)). N_(DL) is a downlinkEARFCN, and N_(UL) is an uplink EARFCN. F_(DL-low), N_(Offs-DL),F_(UL-low), and N_(Offs-UL) may be determined by Table 1.

TABLE 1 E-UTRA Downlink Uplink Operating F_(DL) _(—) _(low) Range F_(UL)_(—) _(low) Range Band (MHz) N_(Offs-DL) of N_(DL) (MHz) N_(Offs-UL) ofN_(UL) 1 2110 0  0-599 1920 18000 18000-18599 2 1930 600  600-1199 185018600 18600-19199 3 1805 1200 1200-1949 1710 19200 19200-19949 4 21101950 1950-2399 1710 19950 19950-20399 5 869 2400 2400-2649 824 2040020400-20649 6 875 2650 2650-2749 830 20650 20650-20749 7 2620 27502750-3449 2500 20750 20750-21449 8 925 3450 3450-3799 880 2145021450-21799 9 1844.9 3800 3800-4149 1749.9 21800 21800-22149 10 21104150 4150-4749 1710 22150 22150-22749 11 1475.9 4750 4750-4999 1427.922750 22750-22999 12 728 5000 5000-5179 698 23000 23000-23179 13 7465180 5180-5279 777 23180 23180-23279 14 758 5280 5280-5379 788 2328023280-23379 . . . 17 734 5730 5730-5849 704 23730 23730-23849 . . . 331900 26000 36000-36199 1900 36000 36000-36199 34 2010 26200 36200-363492010 36200 36200-36349 35 1850 26350 36350-36949 1850 36350 36350-3694936 1930 26950 36950-37549 1930 36950 36950-37549 37 1910 2755037550-37749 1910 37550 37550-37749 38 2570 27750 37750-38249 2570 3775037750-38249 39 1880 28250 38250-38649 1880 38250 38250-38649 40 230028650 38650-39649 2300 38650 38650-39649

The basic separation of an E-UTRA Tx channel and Rx channel may bedetermined by Table 2.

TABLE 2 Frequency Band TX-RX carrier centre frequency separation 1 190MHz  2 80 MHz 3 95 MHz 4 400 MHz  5 45 MHz 6 45 MHz 7 120 MHz  8 45 MHz9 95 MHz 10 400 MHz  11 48 MHz 12 30 MHz 13 −31 MHz   14 −30 MHz   17 30MHz

Hereinafter, an uplink reference signal (RS) will be described.

In general, an RS is transmitted as a sequence. Any sequence can be usedas a sequence used for an RS sequence without particular restrictions.The RS sequence may be a phase shift keying (PSK)-based computergenerated sequence. Examples of the PSK include binary phase shiftkeying (BPSK), quadrature phase shift keying (QPSK), etc. Alternatively,the RS sequence may be a constant amplitude zero auto-correlation(CAZAC) sequence. Examples of the CAZAC sequence include a Zadoff-Chu(ZC)-based sequence, a ZC sequence with cyclic extension, a ZC sequencewith truncation, etc. Alternatively, the RS sequence may be apseudo-random (PN) sequence. Example of the PN sequence include anm-sequence, a computer generated sequence, a Gold sequence, a Kasamisequence, etc. In addition, the RS sequence may be a cyclically shiftedsequence.

The uplink RS can be classified into a demodulation reference signal(DMRS) and a sounding reference signal (SRS). The DMRS is an RS used forchannel estimation to demodulate a received signal. The DMRS can becombined with PUSCH or PUCCH transmission. The SRS is an RS transmittedfor uplink scheduling by a UE to a BS. The BS estimates an uplinkchannel by using the received SRS, and the estimated uplink channel isused in uplink scheduling. The SRS is not combined with PUSCH or PUCCHtransmission. The same type of base sequences can be used for the DMRSand the SRS. Meanwhile, precoding applied to the DMRS in uplinkmulti-antenna transmission may be the same as precoding applied to thePUSCH. Cyclic shift separation is a primary scheme for multiplexing theDMRS. In an LTE-A system, the SRS may not be precoded, and may be anantenna-specific RS.

The SRS is an RS transmitted by a relay station to the BS and is an RSwhich is not related to uplink data or control signal transmission. Ingeneral, the SRS may be used for channel quality estimation forfrequency selective scheduling in uplink or may be used for otherusages. For example, the SRS may be used in power control, initial MCSselection, initial power control for data transmission, etc. In general,the SRS is transmitted in a last SC-FDMA symbol of one subframe.

An operation in UE for the transmission of an SRS is as follows.C_(SRS), that is, a cell-specific SRS transmission bandwidth may begiven by a higher layer, and a cell-specific SRS transmission subframemay be given by a higher layer. If UE can select a transmit antenna, theindex a(n_(SRS)) of a UE antenna that transmits an SRS at a time n_(SRS)is given a(n_(SRS))=n_(SRS) mod 2 for the full sounding bandwidth or thepartial sounding bandwidth when frequency hopping is not available andmay be given by Equation 2 when frequency hopping is available.

$\begin{matrix}{{a\left( n_{SRS} \right)} = \left\{ \begin{matrix}{\left( {n_{SRS} + \left\lfloor {n_{SRS}\text{/}2} \right\rfloor + {\beta \cdot \left\lfloor {n_{SRS}\text{/}K} \right\rfloor}} \right){mod}\mspace{14mu} 2} & {{when}\mspace{14mu} K\mspace{11mu}{is}\mspace{14mu}{even}} \\{{n_{SRS}\mspace{14mu}{mod}\mspace{14mu} 2}\mspace{275mu}} & {{{when}\mspace{14mu} K\mspace{14mu}{is}\mspace{14mu}{odd}}\;}\end{matrix} \right.} & {{Equation}\mspace{14mu} 2}\end{matrix}$

In Equation 2, B_(SRS) indicates an SRS bandwidth, and b_(hop) indicatesa frequency hopping bandwidth. N_(b) may be determined by apredetermined table according to C_(SRS) and B_(SRS).

$K = {\prod\limits_{b^{\prime} = b_{hop}}^{B_{SRS}}\; N_{b^{\prime}.}}$

In Equation 2, β may be determined by Equation 3.

$\begin{matrix}{\beta = \left\{ \begin{matrix}1 & {{{where}\mspace{14mu} K\mspace{14mu}{mod}\mspace{14mu} 4} = 0} \\0 & {{otherwise}\mspace{115mu}}\end{matrix} \right.} & {{Equation}\mspace{14mu} 3}\end{matrix}$

If one SC-FDMA symbol exists within an uplink pilot time slot (UpPTS) ina TDD system, the one SC-FDMA symbol may be used for SRS transmission.If two SC-FDMA symbols exist within an UpPTS, both the two SC-FDMAsymbols may be used for SRS transmission and may be allocated to one UEat the same time.

UE does not always transmit an SRS whenever the transmission of an SRSand the transmission of PUCCH format 2/2a/2b occur within the samesubframe at the same time.

If an ackNackSRS-SimultaneousTransmission parameter is false, UE doesnot always transmit an SRS whenever the transmission of an SRS and thetransmission of a PUCCH that carries ACK/NACK and/or a positive SR areperformed in the same subframe. Furthermore, if anackNackSRS-SimultaneousTransmission parameter is true, UE uses ashortened PUCCH format and transmits a PUCCH that carries ACK/NACKand/or a positive SR and an SRS at the same time when the transmissionof the SRS and the transmission of the PUCCH that carries ACK/NACKand/or a positive SR are configured in the same subframe. That is, if aPUCCH that carries ACK/NACK and/or a positive SR and an SRS isconfigured within an SRS subframe configured in a cell specific manner,UE uses a shortened PUCCH format and transmits the PUCCH that carriesACK/NACK and/or a positive SR and the SRS at the same time.

If SRS transmission overlaps with a physical random access channel(PRACH) region for the preamble format 4 or exceeds the range of anuplink system bandwidth configured in a cell, UE does not transmit anSRS.

ackNackSRS-SimultaneousTransmission, that is, a parameter given by ahigher layer, determines whether UE supports the simultaneoustransmission of a PUCCH that carries ACK/NACK and an SRS within onesubframe. If UE is configured to transmit a PUCCH that carries ACK/NACKand an SRS within one subframe at the same time, the UE may transmitsthe ACK/NACK and the SRS in a cell-specific SRS subframe. Here, ashortened PUCCH format may be used, and the transmission of ACK/NACK oran SR corresponding to a position where the SRS is transmitted ispunctured. The shortened PUCCH format is used in the cell-specific SRSsubframe even when the UE does not transmit the SRS in the relevantsubframe. If UE is configured not to transmit a PUCCH that carriesACK/NACK and an SRS within one subframe at the same time, the UE may usecommon PUCCH formats 1/1a/1b in order to transmit the ACK/NACK and theSR.

Tables 3 and 4 are examples of a UE-specific SRS configuration thatindicates T_(SRS), that is, an SRS transmission periodicity, andT_(offset), that is, an SRS subframe offset. The SRS transmissionperiodicity T_(SRS) may be determined as one of {2, 5, 10, 20, 40, 80,160, 320} ms.

Table 3 is an example of an SRS configuration in an FDD system.

TABLE 3 SRS Configuration Index SRS Periodicity SRS Subframe OffsetI_(SRS) T_(SRS) (ms) T_(offset) 0-1 2 I_(SRS) 2-6 5 I_(SRS) − 2   7-1610 I_(SRS) − 7  17-36 20 I_(SRS) − 17 37-76 40 I_(SRS) − 37  77-156 80I_(SRS) − 77 157-316 160  I_(SRS) − 157 317-636 320  I_(SRS) − 317 637-1023 reserved reserved

Table 4 is an example of an SRS configuration in a TDD system.

TABLE 4 Configuration Index SRS Periodicity SRS Subframe Offset I_(SRS)T_(SRS) (ms) T_(offset) 0 2 0, 1 1 2 0, 2 2 2 1, 2 3 2 0, 3 4 2 1, 3 5 20, 4 6 2 1, 4 7 2 2, 3 8 2 2, 4 9 2 3, 4 10-14 5 I_(SRS) − 10 15-24 10I_(SRS) − 15 25-44 20 I_(SRS) − 25 45-84 40 I_(SRS) − 45  85-164 80I_(SRS) − 85 165-324 160  I_(SRS) − 165 325-644 320  I_(SRS) − 325 645-1023 reserved reserved

In the case of T_(SRS)>2 in a TDD system, an SRS subframe in an FDDsystem satisfy (10*n_(f)+k_(SRS)−T_(offset)) mod T_(SRS)=0. n_(f)indicates a frame index, and k_(SRS) is a subframe index within a framein an FDD system. In the case of T_(SRS)=2 in a TDD system, 2 SRSresources may be configured within a half frame including at least oneuplink subframe, and an SRS subframe satisfies (k_(SRS)−T_(offset))mod5=0.

In a TDD system, k_(SRS) may be determined by Table 5.

TABLE 5 Subframe index n 1 6 1^(st) symbol 2^(nd) symbol 1^(st) symbol2^(nd) symbol 0 of UpPTS of UpPTS 2 3 4 5 of UpPTS of UpPTS 7 8 9k_(SRS) in case UpPTS 0 1 2 3 4 5 6 7 8 9 length of 2 symbols k_(SRS) incase UpPTS 1 2 3 4 6 7 8 9 length of 1 symbol

Meanwhile, UE does not always transmit an SRS if the transmission of theSRS and the transmission of a PUSCH, corresponding to the retransmissionof the same transport block as part of a random access response grant ora contention-based random access procedure, are performed within thesame subframe.

Channel coding for PUSCH transmission is described below.

FIG. 10 is an example of a process of processing an uplink sharedchannel (UL-SCH) transport channel. A coding unit is reached in the formof one maximum transport block at each transmit time interval (TTI).

Referring to FIG. 10, at step S100, a cyclic redundancy check (CRC) isattached to a transport block. When the CRC is attached, error detectionfor an UL-SCH transport block can be supported. All transport blocks maybe used to calculate a CRC parity bit. Bits within a transport blocktransferred in a layer 1 are a₀, . . . , a_(A-1), and parity bits may berepresented by p₀, . . . , p_(L-1). The size of the transport block isA, and the size of the parity bit is L. a0, that is, the information bitof the smallest order, may be mapped to the most significant bit (MSB)of the transport block.

At step S110, the transport block to which the CRC is attached issegmented into a plurality of code blocks, and a CRC is attached to eachof the code blocks. Bits before they are segmented into the code blocksmay be represented by b₀, . . . , b_(B-1), and B is the number of bitswithin the transport block including the CRC. Bits after they aresegmented into the code blocks may be represented by c_(r0), . . . ,c_(r(Kr-1)), r is a code block number, and Kr is the number of bits ofthe code block number r.

At step S120, channel coding is performed on each of the code blocks.The total number of code blocks is C, and the channel coding may beperformed on each code block according to a turbo coding scheme. Thebits on which the channel coding has been performed may be representedby d_(r0) ^((i)), . . . , d_(r(Dr-1)) ^((i)), and Dr is the number ofbits of an i^(th) coded stream of the code block number r. Dr=Kr+4, andi is a coded stream index and may be 0, 1 or 2.

At step S130, rate matching is performed on each code block on which thechannel coding has been performed. The rate matching may be performedfor code block individually. Bits after the rate matching is performedmay be represented by e_(r0), . . . , e_(r(Er-1)), r is a code blocknumber, and Er is the number of rate matched bits of the code blocknumber r.

At step S140, the code blocks on which the rate matching has beenperformed are concatenated. Bits after the code blocks are concatenatedmay be represented by f₀, . . . , f_(G-1), and G is the total number ofcoded transmission bits other than bits that are used to transmitcontrol information. Here, the control information may be multiplexedwith UL-SCH transmission.

At steps S141 to S143, channel coding is performed on the controlinformation. The control information may include channel qualityinformation (CQI) and/or CQI including a precoding matrix indicator(PMI), hybrid automatic repeat request (HARQ)-acknowledgement (ACK), anda rank indicator (RI). Or, it is hereinafter assumed that the CQIincludes a PMI. A different coding rate is applied to each piece ofcontrol information depending on the number of different coding symbols.When the control information is transmitted in a PUSCH, channel codingon CQI, an RI, and HARQ-ACK is independently performed. In the presentembodiment, it is assumed that the channel coding is performed on CQI atstep S141, the channel coding is performed on an RI at step S142, andthe channel coding is performed on HARQ-ACK at step S143, but notlimited thereto.

In a TDD system, two types of HARQ-ACK feedback modes of HARQ-ACKbundling and HARQ-ACK multiplexing may be supported by a higher layer.In the TDD HARQ-ACK bundling mode, HARQ-ACK includes one or twoinformation bits. In the TDD HARQ-ACK multiplexing mode, HARQ-ACKincludes one to four information bits.

If UE transmits HARQ-ACK bits or RI bits, the number of coded symbols Q′may be determined by Equation 4.

$\begin{matrix}{Q^{\prime} = {\min{\quad\left( {\left\lceil \frac{O \cdot M_{sc}^{{PUSCH} - {initial}} \cdot N_{symb}^{{PUSCH} - {initial}} \cdot \beta_{offset}^{PUSCH}}{\sum\limits_{r = 0}^{C - 1}\; K_{r}} \right\rceil,{4 \cdot M_{sc}^{PUSCH}}} \right)}}} & {{Equation}\mspace{14mu} 4}\end{matrix}$

In Equation 4, O is the number of HARQ-ACK bits or RI bits, and M_(sc)^(PUSCH) is a bandwidth scheduled for PUSCH transmission in the currentsubframe of a transport block which is represented by the number ofsubcarriers. N_(symb) ^(PUSCH-initial) is the number of SC-FDMA symbolsin each subframe for initial PUSCH transmission in the same transportblock and may be determined as N_(symb) ^(PUSCH-initial)=(2*(N_(symb)^(UL)−1)−N_(SRS)). If UE is configured to transmit a PUSCH and an SRS inthe same subframe for initial transmission or the allocation of PUSCHresources for initial transmission partially overlaps with a bandwidthallocated for the transmission of a cell-specific SRS subframe and SRS,N_(SRS)=1. In the remaining cases, N_(SRS)=0. M_(sc) ^(PUSCH-initial),C, and Kr may be obtained from an initial PDCCH for the same transportblock. If there is no DCI format 0 within the initial PDCCH for the sametransport block, M_(sc) ^(PUSCH-initial), C, and Kr may be obtained froma PDCCH that has been semi-persistently allocated most recently when theinitial PUSCH for the same transport block has been semi-persistentlyscheduled and may be obtained from a random access response grant forthe same transport block when a PUSCH has been initiated from a randomaccess response grant.

In HARQ-ACK transmission, Q_(ACK)=Q_(m)*Q′, β_(offset)^(PUSCH)=β_(offset) ^(HARQ-ACK). Furthermore, in RI transmission,Q_(RI)=Q_(m)*Q′, β_(offset) ^(PUSCH)=β_(offset) ^(RI).

In HARQ-ACK transmission, ACK may be encoded into ‘1’ from a binarynumber, and NACK may be encoded into ‘0’ from a binary number. IfHARQ-ACK is [o₀ ^(ACK)] including 1-bit information, the HARQ-ACK may beencoded according to Table 6.

TABLE 6 Q_(m) Encoded HARQ-ACK 2 [o₀ ^(ACK) y] 4 [o₀ ^(ACK) y x x] 6 [o₀^(ACK) y x x x x

If HARQ-ACK is [o₀ ^(ACK) o₁ ^(ACK)] including 2-bit information, theHARQ-ACK may be encoded according to Table 7. In Table 7, o₂ ^(ACK)=(o₀^(ACK)+o₁ ^(ACK))mod 2.

TABLE 7 Q_(m) Encoded HARQ-ACK 2 [o₀ ^(ACK) o₁ ^(ACK) o₂ ^(ACK) o₀^(ACK) o₁ ^(ACK) o₂ ^(ACK)] 4 [o₀ ^(ACK) o₁ ^(ACK) x x o₂ ^(ACK) o₀^(ACK) x x o₁ ^(ACK) o₂ ^(ACK) x x] 6 [o₀ ^(ACK) o₁ ^(ACK) x x x x o₂^(ACK) o₀ ^(ACK) x x x x o₁ ^(ACK) o₂ ^(ACK) x x x x]

In Tables 6 and 7, x and y indicate placeholders for scrambling HARQ-ACKbits for a method of maximizing the Euclidean distance of a modulationsymbol for carrying HARQ-ACK information.

When HARQ-ACK includes one or two information bits, in the case of theFDD or TDD HARQ-ACK multiplexing mode, a bit sequence q₀ ^(ACK), . . . ,q_(QACK-1) ^(ACK) may be obtained by concatenating a plurality ofencoded HARQ-ACK block. Here, Q_(ACK) is the total number of encodedbits within all the encoded HARQ-ACK blocks. The concatenation of thelast HARQ-ACK block may be partially performed in order to match thetotal length of the bit sequence with Q_(ACK).

In the case of the TDD HARQ-ACK bundling mode, a bit sequence {tildeover (q)}₀ ^(ACK), . . . , {tilde over (q)}_(Q) _(ACK) ₋₁ ^(ACK) may beobtained by concatenating a plurality of encoded HARQ-ACK blocks. Here,Q_(ACK) is the total number of encoded bits within all the encodedHARQ-ACK blocks. The concatenation of the last HARQ-ACK block may bepartially performed in order to match the total length of the bitsequence with Q_(ACK). A scrambling sequence [w₀ ^(ACK) w₁ ^(ACK) w₂^(ACK) w₃ ^(ACK)] may be determined by Table 8.

TABLE 8 i [w₀ ^(ACK) w₁ ^(ACK) w₂ ^(ACK) w₃ ^(ACK)] 0 [1 1 1 1] 1 [1 0 10] 2 [1 1 0 0] 3 [1 0 0 1]

If HARQ-ACK is [o₀ ^(ACK) o_(OACK-1) ^(ACK)] including two or higherinformation bits (O^(ACK)>2), a bit sequence q₀ ^(ACK), . . . ,q_(QACK-1) ^(ACK) may be obtained by Equation 5.

$\begin{matrix}{q_{i}^{ACK} = {\sum\limits_{n = 0}^{O^{ACK} - 1}\;{\left( {o_{n}^{ACK} \cdot M_{{({i\mspace{14mu}{mod}\mspace{14mu} 32})},n}} \right){mod}\mspace{14mu} 2}}} & {{Equation}\mspace{14mu} 5}\end{matrix}$

In Equation 5, i=0, . . . , Q_(ACK)−1.

In RI transmission, the size of a bit of RI feedback corresponding toPDSCH transmission may be determined by assuming a maximum number oflayers according to the antenna configuration of a BS and UE. If an RIis [o₀ ^(RI)] including 1-bit information, the RI may be encodedaccording to Table 9.

TABLE 9 Q_(m) Encoded RI 2 [o₀ ^(RI) y] 4 [o₀ ^(RI) y x x] 6 [o₀ ^(RI) yx x x x

In Table 9, the mapping of [o₀ ^(RI)] and an RI may be given by Table10.

TABLE 10 o₀ ^(RI) RI 0 1 1 2

If an RI is [o₀ ^(RI) o₁ ^(RI)] including 2-bit information, o₀ ^(RI)corresponds to an MSB from the 2-bit information, and o₁ ^(RI)corresponds to the least significant bit (LSB) of 2 bits, the RI may beencoded according to Table 11. In Table 11, o₂ ^(RI)=(o₀ ^(RI)+o₁^(RI))mod 2.

TABLE 11 Q_(m) Encoded RI 2 [o₀ ^(RI) o₁ ^(RI) o₂ ^(RI) o₀ ^(RI) o₁^(RI) o₂ ^(RI)] 4 [o₀ ^(RI) o₁ ^(RI) x x o₂ ^(RI) o₀ ^(RI) x x o₁ ^(RI)o₂ ^(RI) x x] 6 [o₀ ^(RI) o₁ ^(RI) x x x x o₂ ^(RI) o₀ ^(RI) x x x x o₁^(RI) o₂ ^(RI) x x x x]

In Table 11, the mapping of [o₀ ^(RI) o₁ ^(RI)] and an RI may be givenby Table 12.

TABLE 12 o₀ ^(RI) · o₁ ^(RI) RI 0, 0 1 0, 1 2 1, 0 3 1, 1 4

In Tables 6 and 7, x and y indicate placeholders for scrambling HARQ-ACKbits for a method of maximizing the Euclidean distance of a modulationsymbol for carrying HARQ-ACK information.

A bit sequence q₀ ^(RI), . . . q_(QRI-1) ^(RI) may be obtained byconcatenating a plurality of encoded RI blocks. Here, Q_(RI) is thetotal number of encoded bits within all the encoded RI blocks. Theconcatenation of the last RI block may be partially performed in orderto match the total length of the bit sequence with Q_(RI).

If UE transmits CQI bits, the number of coded symbols Q′ may bedetermined by Equation 6.

$\begin{matrix}{Q^{\prime} = {\min{\quad\left( {\left\lceil \frac{\left( {O + L} \right) \cdot M_{sc}^{{PUSCH} - {initial}} \cdot N_{symb}^{{PUSCH} - {initial}} \cdot \beta_{offset}^{PUSCH}}{\sum\limits_{r = 0}^{C - 1}\; K_{r}} \right\rceil,{{M_{sc}^{PUSCH} \cdot N_{symb}^{PUSCH}} - \frac{Q_{N}}{Q_{m}}}} \right)}}} & {{Equation}\mspace{14mu} 6}\end{matrix}$

In Equation 6, O is the number of CQI bits, and L is the number of CRCbits which is given 0 when O≤11 and given 8 in other cases. Furthermore,Q_(CQI)=Q_(m)*Q′, and β_(offset) ^(PUSCH)=β_(offset) ^(CQI). If an RI isnot sent, Q_(RI)=0. M_(sc) ^(PUSCH-initial), C, and Kr may be obtainedfrom an initial PDCCH for the same transport block. If the DCI format 0does not exist within the initial PDCCH for the same transport block,M_(sc) ^(PUSCH-initial), C, and Kr may be obtained from a PDCCH that hasbeen semi-persistently allocated most recently when the initial PUSCHfor the same transport block has been semi-persistently scheduled andmay be obtained from a random access response grant for the sametransport block when a PUSCH has been initiated from a random accessresponse grant. N_(symb) ^(PUSCH-initial) is the number of SC-FDMAsymbols in each subframe for the transmission of the initial PUSCH inthe same transport block. Regarding UL-SCH data information, G=N_(symb)^(PUSCH)*M_(sc) ^(PUSCH)*Q_(m)−Q_(CQI)−Q_(R). Here, M_(sc) ^(PUSCH) is abandwidth scheduled for PUSCH transmission in the current subframe of atransport block which is represented by the number of subcarriers.N_(symb) ^(PUSCH)=(2*(N_(symb) ^(UL)−1)−N_(SRS)). If UE is configured totransmit a PUSCH and an SRS in the same subframe for initialtransmission or the allocation of PUSCH resources for the initialtransmission partially overlaps with a bandwidth allocated to thetransmission of a cell-specific SRS subframe and SRS, N_(SRS)=1. Inother cases, N_(SRS)=0.

In CQI transmission, when the size of a payload is smaller than 11 bits,the channel coding of CQI information is performed based on an inputsequence o₀, . . . , o_(O-1). When the size of a payload is greater than11 bits, CRC addition, channel coding, and rate matching are performedon the CQI information. The input sequence of the CRC attachment processis o₀, . . . , o_(O-1). An output sequence to which the CRC has beenattached becomes the input sequence of the channel coding process, andthe output sequence of the channel coding process becomes the inputsequence of the rate matching process. The output sequence of the finalchannel coding on the CQI information may be represented by q₀, . . . ,q_(QCQI-1).

At step S150, multiplexing is performed on the data and the controlinformation. Here, the HARQ-ACK information exists both in the two slotsof a subframe, and it may be mapped to resources adjacent to a DMRS.When the data and the control information are multiplexed, they may bemapped to different modulation symbols. Meanwhile, if one or more UL-SCHtransport blocks are transmitted in the subframe of an uplink cell, CQIinformation may be multiplexed with data on an UL-SCH transport blockhaving the highest modulation and coding scheme (MCS).

At step S160, channel interleaving is performed. The channelinterleaving may be performed in connection with PUSCH resource mapping.Modulation symbols may be mapped to a transmit waveform in a time-firstmapping manner through the channel interleaving. The HARQ-ACKinformation may be mapped to resources adjacent to an uplink DMRS, andthe RI information may be mapped to the periphery of resources used bythe HARQ-ACK information.

A proposed data transmission method is described below. As describedabove, LTE-A may use a plurality of CCs as transmission resources in aspecific cell, and each UE uniquely sets carriers used in downlink oruplink transmission. Furthermore, if an SRS and a PUSCH are allocated tothe same subframe in a single carrier, the sounding process of UE isdefined in LTE rel-8, but it has not been defined in a carrieraggregation system. Accordingly, the present invention proposes a methodof transmitting a PUSCH and an SRS in a carrier aggregation system inwhich a plurality of CCs exist.

In a carrier aggregation system, the transmission of an SRS isindependently configured for each CC. That is, a subframe in which anSRS can be transmitted is independently configured for each CCirrespective of whether the SRS has been actually transmitted. Forexample, in a specific subframe, a first carrier may be configured sothat it transmits an SRS and a second carrier may be configured so thatit transmits a PUSCH. As described above, when one carrier transmits anSRS and the other carrier transmits a PUSCH in the same subframe, it isdifficult to maintain a single carrier property for the SRS. Inparticular, a peak-to-average power ratio (PAPR) and cubic metric (CM)characteristics are deteriorated in an SC-FDMA symbol in which an SRS istransmitted. Accordingly, regarding an SRS and a PUSCH transmitted indifferent CCs in the same subframe, maximum transmit power allocated toeach UE may be limited. In particular, when power boosting is applied inorder to increase the coverage of an SRS, the maximum transmit power ofeach UE may be further limited.

Meanwhile, the SRS transmission method may be divided into two types: aperiodic SRS transmission method of transmitting an SRS periodicallyaccording to an SRS parameter received by radio resource control (RRC)signaling, which is a method defined in LTE rel-8, and an aperiodic SRStransmission method of transmitting an SRS whenever the SRS is necessarybased on a message dynamically triggered by a BS. In LTE-A, theaperiodic SRS transmission method may be introduced.

In the periodic SRS transmission method and the aperiodic SRStransmission method, an SRS may be transmitted in a UE-specific SRSsubframe determined in a UE-specific manner. In the periodic SRStransmission method defined in LTE rel-8, a cell-specific SRS subframeis periodically configured by a cell-specific SRS parameter, and aperiodic SRS is transmitted in a periodic UE-specific SRS subframeconfigured by a UE-specific SRS parameter in the cell-specific SRSsubframe. Here, the periodic UE-specific SRS subframe may be a subset ofthe cell-specific SRS subframe. The cell-specific SRS parameter may begiven by a higher layer. In the aperiodic SRS transmission method, anaperiodic SRS may be transmitted in an aperiodic UE-specific SRSsubframe determined by a UE-specific aperiodic SRS parameter. TheUE-specific SRS subframe of the aperiodic SRS transmission method may bea subset of the cell-specific SRS subframe as defined in LTE rel-8. Or,the aperiodic UE-specific SRS subframe may be identical with thecell-specific SRS subframe. Like the cell-specific SRS parameter, theUE-specific aperiodic SRS parameter may be given by a higher layer. TheUE-specific SRS subframe may be determined by the periodicity of thesubframe and the offset of the subframe in Table 3 or Table 4 describedabove.

Accordingly, the present invention proposes a method of allocating anSRS and a PUCCH/PUSCH at the same time in an SRS subframe determined ina UE-specific or cell-specific manner in a carrier aggregation system,wherein SRS transmission can maintain a single carrier characteristicand transmit power is reduced.

The present invention is described below according to each of PUCCHformats.

1) PUCCH Formats 1/1a/1b

The PUCCH format 1 carries an SR. Here, an on-off keying (OOK) schememay be applied. The PUCCH format 1a carries ACK/NACK modulated accordingto a bit phase shift keying (BPSK) scheme for one codeword. The PUCCHformat 1b carries ACK/NACK modulated according to a quadrature phaseshift keying (QPSK) scheme for two codewords.

In a carrier aggregation system, an SRS and a PUCCH/PUSCH are allocatedto the same subframe and transmitted, wherein one of the allocation ofthe SRS and the allocation of the PUCCH/PUSCH may be given priority inorder to maintain the single carrier characteristic of SRS transmission.

First, the SRS may be given priority.

When an SRS and a PUCCH/PUSCH are allocated at the same time through aplurality of CCs in the same subframe, the allocation and transmissionof the SRS is given priority. To this end, the transmission of thePUCCH/PUSCH may be limited in the last SC-FDMA symbol to which the SRSis allocated in the corresponding subframe. Here, the PUCCH may useshortened PUCCH formats 1/1a/1b as a method of not transmitting thePUCCH in the last SC-FDMA symbol to which the SRS is allocated. Ratematching or puncturing may be applied to the PUSCH as a method of nottransmitting the PUSCH in the last SC-FDMA symbol to which the SRS isallocated. The amount of data to be transmitted may be matched with amaximum amount of PUSCHs in which data is actually transmitted at atransmission time interval (TTI) through the rate matching. In thepresent invention, the rate matching may be performed except the lastSC-FDMA symbol to which the SRS is allocated. Or, in the state in whichthe amount of data to be transmitted is matched with the maximum amountof data that can be transmitted through the PUSCH within one subframe,puncturing in which transmission through the PUSCH is not performed maybe performed on data allocated to the last SC-FDMA symbol to which theSRS is allocated.

FIGS. 11 to 13 are examples of constructions regarding data transmissionmethods in proposed SRS subframes.

The SRS subframe of FIGS. 11 to 13 is any one of SRS subframesdetermined in a UE-specific manner. Or, the SRS subframe of FIGS. 11 to13 is any one of SRS subframes determined in a cell specific manner.

FIG. 11-(a) is the case where a PUSCH is simultaneously allocated to anUL CC in which an SRS is transmitted. The last SC-FDMA symbol of the SRSsubframe of an UL CC #2 is allocated for SRS transmission, and a PUSCHmay be allocated to the remaining SC-FDMA symbol in order to transmitdata. A PUCCH that uses the shortened PUCCH formats 1/1a/1b may beallocated to an UL CC #1 in order to transmit uplink control information(UCI). As described above, in a single carrier system, if theackNackSRS-SimultaneousTransmission parameter is true, UE uses theshortened PUCCH formats 1/1a/1b when the transmission of an SRS and thetransmission of a PUCCH that carries ACK/NACK and/or a positive SR areconfigured in the same subframe and simultaneously transmits the SRS andthe PUCCH that carries ACK/NACK and/or a positive SR. That is, if aPUCCH that carries ACK/NACK and/or a positive SR is configured within anSRS subframe configured in a cell-specific manner, UE uses the shortenedPUCCH formats 1/1a/1b and simultaneously transmits the SRS and the PUCCHthat carries ACK/NACK and/or a positive SR. If the UL CC #1 isconfigured so that it uses the shortened PUCCH formats 1/1a/1b and theSRS is configured so that it is transmitted in the UL CC #2 by applyingthe method to a carrier aggregation system, the shortened PUCCH formats1/1a/1b in the UL CC #1 and the SRS in the UL CC #2 can be transmittedat the same time.

FIG. 11-(b) is the case where a PUSCH is not allocated to an UL CC inwhich an SRS is transmitted. The last SC-FDMA symbol of the SRS subframeof an UL CC #2 is allocated for SRS transmission, and a PUCCH that usesthe shortened PUCCH formats 1/1a/1b may be allocated to an UL CC #1 inorder to transmit UCI. As described above, in a single carrier system,if the ackNackSRS-SimultaneousTransmission parameter is true, UE usesthe shortened PUCCH formats 1/1a/1b when the transmission of an SRS andthe transmission of a PUCCH that carries ACK/NACK and/or a positive SRare configured in the same subframe and simultaneously transmits the SRSand the PUCCH that carries ACK/NACK and/or a positive SR. That is, if aPUCCH that carries ACK/NACK and/or a positive SR is configured within anSRS subframe configured in a cell-specific manner, UE uses the shortenedPUCCH formats 1/1a/1b and simultaneously transmits the SRS and the PUCCHthat carries ACK/NACK and/or a positive SR. If the UL CC #1 isconfigured so that it uses the shortened PUCCH formats 1/1a/1b and theSRS is configured so that it is transmitted in the UL CC #2 by applyingthe method to a carrier aggregation system, the shortened PUCCH formats1/1a/1b in the UL CC #1 and the SRS in the UL CC #2 can be transmittedat the same time.

FIG. 12-(a) is the case where a PUSCH is simultaneously allocated to anUL CC in which an SRS is transmitted and a PUSCH is also simultaneouslyallocated to an UL CC in which a PUCCH is transmitted. The last SC-FDMAsymbol of the SRS subframe of an UL CC #2 is allocated for thetransmission of the SRS. FIG. 12-(b) is the case where a PUSCH is notallocated to an UL CC in which an SRS is transmitted and a PUSCH issimultaneously allocated to an UL CC in which a PUCCH is transmitted.The last SC-FDMA symbol of the SRS subframe of an UL CC #2 is allocatedfor the transmission of the SRS.

FIG. 13 is the case where a PUSCH is simultaneously allocated to an ULCC in which an SRS is transmitted and UCI transmitted through a PUCCH issubject to piggyback through the PUSCH and transmitted together withuplink data. The last SC-FDMA symbol of the SRS subframe of an UL CC #2is allocated for the transmission of the SRS, and UCI is transmittedthrough the PUSCH in an UL CC #1.

In FIGS. 11 to 13, the shortened PUCCH format 1/1a/1b is assumed to beused, but not limited thereto. The present invention may be applied tothe shortened PUCCH formats 2/2a/2b, the shortened PUCCH format 3, orany PUCCH formats to be subsequently defined instead of the shortenedPUCCH formats 1/1a/1b.

A PUSCH may be subject to rate matching except the last SC-FDMA symbolto which an SRS is allocated. The transmission of the PUSCH in acorresponding SRS subframe may be subject to rate matching so that thePUSCH transmission is performed in the remaining SC-FDMA symbols inwhich the SRS is not transmitted without a limit to a relationshipbetween the transmission bandwidth of the SRS and a bandwidth occupiedby the PUSCH. Or, a PUSCH allocated to the last SC-FDMA symbol may bepunctured without performing rate matching on the PUSCH. When the PUSCHis subject to the rate matching, a data rate corresponding to oneSC-FDMA symbol when data is transmitted through the PUSCH can bereduced, and reliability and coverage of SRS transmission can beimproved. Furthermore, from a viewpoint of SRS transmission, a singlecarrier property can be maintained in the last SC-FDMA symbol of an SRSsubframe.

A bandwidth occupied by an SRS in the last SC-FDMA symbol of the SRSsubframe in FIGS. 11 to 13 may be the entire system bandwidth or may bea narrow band or partial bandwidth. Furthermore, the bandwidth occupiedby the SRS in the last SC-FDMA symbol of the SRS subframe may be aUE-specific SRS bandwidth defined in LTE rel-8/9 and may be an SRSbandwidth newly defined in LTE-A. A bandwidth occupied by a PUSCH in theremaining SC-FDMA symbols is not limited.

The above-described rate matching or puncturing may be selectivelyapplied according to the transmission mode or channel environment ofcorresponding UE and may be implicitly indicated through already definedother parameters or may be indicated by explicitly signaling a newlydefined parameter. Furthermore, the type of PUCCH format used andwhether UCI to be transmitted through a PUCCH is transmitted bypiggybacking to a PUSCH, together with uplink data, or not may beimplicitly indicated through other parameters or may be indicated byexplicitly signaling a newly defined parameter. Here, the indication maybe configured in either a cell-specific or UE-specific manner.

Or, if the SRS transmission band of a plurality of UEs is indicatedthrough a higher layer or signaling so that it is multiplexed within onecarrier, the rate matching or puncturing of the plurality of UEs may beapplied in a cell-specific or carrier-specific manner within at leastcorresponding carrier.

Or, although the SRS transmission band of a plurality of UEs isindicated through a higher layer or signaling so that it is multiplexedwithin one carrier, whether the rate matching or puncturing of a PUSCHwill be applied or not may be explicitly L1/L2 signalized or RRCsignalized in a UE-specific manner.

Or, the PUCCH/PUSCH may be given priority instead of the SRS.

When an SRS and a PUCCH/PUSCH are allocated at the same time through aplurality of CCs in the same subframe, the allocation and transmissionof the PUCCH/PUSCH are given priority. That is, the transmission of theSRS may be dropped, uplink data may be transmitted through the allocatedPUSCH, and UCI may be transmitted through the normal PUCCH formats1/1a/1b. Accordingly, the multiplexing capacity and performance of UEcan be maintained as in the prior art, and the data rate of PUSCHtransmission and quality of service (QoS) of data transmitted throughthe PUSCH can be guaranteed.

Or whether an SRS will be first allocated or whether a PUCCH/PUSCH willbe first allocated may be determined through an RRC message. There is anadvantage in that a resource allocation method can be flexibly changeddepending on the transmission mode or channel environment of each UE.For example, whether an SRS will be first allocated or whether aPUCCH/PUSCH will be first allocated may be determined according to anRRC message indicating the simultaneous transmission of the PUSCH/PUCCH.That is, if the simultaneous transmission of the PUSCH/PUCCH isindicated, an SRS is given priority and the SRS and the PUCCH/PUSCH aretransmitted in an SRS subframe at the same time. If the simultaneoustransmission of the PUSCH/PUCCH is not indicated, the PUCCH/PUSCH isgiven priority and the transmission of an SRS may be dropped. Or,whether an SRS will be first allocated or whether the PUCCH/PUSCH willbe first allocated may be determined according to a newly defined RRCmessage.

Meanwhile, in the above description, the present invention is assumed tobe applied to a carrier aggregation system including two or more CCs,but not limited thereto. The present invention may be applied to thecase where the number of carriers is 1. That is, if an SRS and aPUCCH/PUSCH are configured within one CC so that they are transmitted atthe same time, the present invention may be applied. More particularly,the transmission of an SRS may be given priority, and the shortenedPUCCH formats 1/1a/1b and the SRS may be allocated to an SRS subframeand transmitted simultaneously. Accordingly, reliability and coverage ofUCI transmission can be increased. Furthermore, from a viewpoint of SRStransmission, a single carrier property can be maintained in the lastSC-FDMA symbol of an SRS subframe. Or, the transmission of a PUCCH/PUSCHmay be given priority, and the transmission of an SRS may be dropped.Accordingly, uplink data can be transmitted through the allocated PUSCH,and UCI can be transmitted through the normal PUCCH formats 1/1a/1b orthe shortened PUCCH formats 1/1a/1b. Accordingly, the multiplexingcapacity and performance of UE can be maintained as in the prior art,and the data rate of PUSCH transmission and quality of service (QoS) ofdata transmitted through the PUSCH can be guaranteed. Whether thetransmission of an SRS will be given priority or the transmission of aPUCCH/PUSCH will be given priority may be indicated by a parameter thatindicates the simultaneous transmission of ACK/NACK and an SRS definedin LTE rel-8. Or, whether the transmission of an SRS will be firstallocated or the transmission of a PUCCH/PUSCH will be first allocatedmay be determined according to an RRC message that indicates thesimultaneous transmission of a PUSCH and a PUCCH. Or, whether thetransmission of an SRS will be first allocated or the transmission of aPUCCH/PUSCH will be first allocated may be determined according to anewly defined RRC message.

2) PUCCH Formats 2/2a/2b

The PUCCH format 2 carries a channel quality indicator (CQI) modulatedaccording to various modulation schemes. The PUCCH formats 2a and 2bcarry a CQI and ACK/NACK.

In the case of the PUCCH formats 2/2a/2b, like in the PUCCH formats1/1a/1b, in a carrier aggregation system, an SRS and a PUCCH/PUSCH areallocated at the same subframe and transmitted, wherein any one of theallocation of the SRS and the allocation of the PUCCH/PUSCH may be givenpriority in order to maintain the single carrier property of SRStransmission.

FIGS. 14 to 16 are examples of constructions regarding a datatransmission method in a proposed SRS subframe.

The SRS subframe of FIGS. 14 to 16 may be any one subframe of SRSsubframes determined in a UE-specific manner. The SRS subframe of FIGS.14 to 16 is any one subframe of SRS subframes determined in a cellspecific manner.

FIG. 14 is the case where an SRS is given priority over a PUCCH/PUSCH.FIG. 14-(a) is the case where the PUSCH is simultaneously allocated toan UL CC in which the SRS is transmitted. The last SC-FDMA symbol of theSRS subframe of an UL CC #2 is allocated for the transmission of theSRS, and the PUSCH may be allocated to the remaining SC-FDMA symbols inorder to transmit data. A PUCCH that uses the PUCCH formats 2/2a/2b maybe allocated to an UL CC #1 in order to transmit UCI. Here, ratematching may be performed on the PUCCH formats 2/2a/2b of the UL CC #1and the PUSCH of the UL CC #2, except the last SC-FDMA symbol allocatedto the SRS, or puncturing is applied to the last SC-FDMA symbol. FIG.14-(b) is the case where a PUSCH is not simultaneously allocated to anUL CC in which an SRS is transmitted. The last SC-FDMA symbol of the SRSsubframe of an UL CC #2 is allocated for the transmission of the SRS. APUCCH that uses the PUCCH formats 2/2a/2b may be allocated to an UL CC#1 in order to transmit UCI. Here, rate matching is performed on thePUCCH formats 2/2a/2b of the UL CC #1 except the last SC-FDMA symbol towhich the SRS has been performed, or puncturing is applied to the lastSC-FDMA symbol.

FIG. 15 is the case where a PUCCH/PUSCH is given priority over an SRS.FIG. 15-(a) is the case where the PUSCH is simultaneously allocated toan UL CC that is configured to transmit the SRS. The transmission of anSRS in an UL CC #2 may be dropped, and a PUSCH may be allocated to theUL CC #2 in order to transmit data. A PUCCH that uses the PUCCH formats2/2a/2b may be allocated to an UL CC #1 in order to transmit UCI. FIG.14-(b) is the case where a PUSCH is not simultaneously allocated to anUL CC that is configured to transmit an SRS. The transmission of an SRSin an UL CC #2 is dropped. A PUCCH that uses the PUCCH formats 2/2a/2bmay be allocated to an UL CC #1 in order to transmit UCI.

FIG. 16 is the case where an SRS is given priority over a PUCCH/PUSCH.FIG. 16-(a) is the case where a PUSCH is simultaneously allocated to anUL CC in which an SRS is transmitted. The last SC-FDMA symbol of the SRSsubframe of an UL CC #2 is allocated for the transmission of the SRS,and a PUSCH may be allocated to the remaining SC-FDMA symbols in orderto transmit data. The PUCCH formats 2/2a/2b of an UL CC #1 is dropped.UCI may be subject to piggyback through the PUSCH and transmitted alongwith uplink data. Here, rate matching is performed on the PUSCH of theUL CC #2 except the last SC-FDMA symbol allocated to the SRS, orpuncturing is applied to the last SC-FDMA symbol. FIG. 16-(b) is thecase where a PUSCH is not simultaneously allocated to an UL CC in whichan SRS is transmitted. The last SC-FDMA symbol of the SRS subframe of anUL CC #2 is allocated for the transmission of the SRS. The PUCCH formats2/2a/2b of an UL CC #1 is dropped. UCI may be subject to piggybackthrough the PUSCH and transmitted along with uplink data.

A bandwidth occupied by an SRS in the last SC-FDMA symbol of the SRSsubframe in FIGS. 14 to 16 may be the entire system bandwidth or may bea narrow band or partial bandwidth. Furthermore, the bandwidth occupiedby the SRS in the last SC-FDMA symbol of the SRS subframe may be aUE-specific SRS bandwidth defined in LTE rel-8/9 and may be an SRSbandwidth newly defined in LTE-A. A bandwidth occupied by a PUSCH in theremaining SC-FDMA symbols is not limited.

The above-described rate matching or puncturing may be selectivelyapplied according to the transmission mode or channel environment ofcorresponding UE and may be implicitly indicated through already definedother parameters or may be indicated by explicitly signaling a newlydefined parameter. Furthermore, the type of PUCCH format used andwhether UCI to be transmitted through a PUCCH is transmitted bypiggybacking to a PUSCH, together with uplink data, or not may beimplicitly indicated through other parameters or may be indicated byexplicitly signaling a newly defined parameter. Here, the indication maybe configured in either a cell-specific or UE-specific manner.

Or, if the SRS transmission band of a plurality of UEs is indicatedthrough a higher layer or signaling so that it is multiplexed within onecarrier, the rate matching or puncturing of the plurality of UEs may beapplied in a cell-specific or carrier-specific manner within at leastcorresponding carrier.

Or, although the SRS transmission band of a plurality of UEs isindicated through a higher layer or signaling so that it is multiplexedwithin one carrier, whether the rate matching or puncturing of a PUSCHwill be applied or not may be explicitly L1/L2 signalized or RRCsignalized in a UE-specific manner.

3) PUCCH Format 3

The PUCCH format 3 is an extended PUCCH format introduced into LTE-A.

The PUCCH format 3 may be replaced with the PUCCH formats 1/1a/1b or2/2a/2b of LTE Rel-8 in order to transmit a more payload in carrieraggregation systems, etc. When CQI/precoding matrix indicator (PMI)/rankindicator (RI) are transmitted for each CC like in ACK/NACK feedbackinformation, payload is increased. Accordingly, there is a need for anew PUCCH format.

The present invention may be applied to the PUCCH format 3 like in themethods applied to the PUCCH formats 1/1a/1b and the PUCCH formats2/2a/2b.

FIGS. 17 to 19 some examples of constructions regarding a datatransmission method in a proposed SRS subframe. The SRS subframe ofFIGS. 17 to 19 may be any one subframe of SRS subframes determined in aUE-specific manner or the SRS subframe of FIGS. 17 to 19 may be an onesubframe of SRS subframes determined in a cell specific manner.

FIG. 17 is the case where an SRS is given priority over a PUCCH/PUSCH.FIG. 17-(a) is the case where a PUSCH is simultaneously allocated to anUL CC in which an SRS is transmitted. UE transmits UCI through theshortened PUCCH format 3 and at the same times ends the SRS throughanother carrier. FIG. 17-(b) is the case where a PUSCH is notsimultaneously allocated to an UL CC in which an SRS is transmitted. UEtransmits UCI through the shortened PUCCH format 3 and at the same timetransmits an SRS through another carrier. In a single carrier system, ifthe ackNackSRS-SimultaneousTransmission parameter is true, UE uses theshortened PUCCH format 3 when the transmission of an SRS and thetransmission of a PUCCH that carries ACK/NACK and/or a positive SR areconfigured in the same subframe and simultaneously transmits the SRS andthe PUCCH that carries ACK/NACK and/or a positive SR. That is, if aPUCCH that carries ACK/NACK and/or a positive SR is configured within anSRS subframe configured in a cell-specific manner, UE uses the shortenedPUCCH format 3 and simultaneously transmits the SRS and the PUCCH thatcarries ACK/NACK and/or a positive SR. Accordingly, if an UL CC #1 isconfigured to use the shortened PUCCH format 3 and an SRS is configuredso that it is transmitted in an UL CC #2, the shortened PUCCH format 3in the UL CC #1 and the SRS in the UL CC #2 can be transmitted at thesame time.

FIG. 18 is the case where a PUCCH/PUSCH is given priority over an SRS.FIG. 18-(a) is the case where a PUSCH is simultaneously allocated to anUL CC configured to transmit an SRS. UE transmits UCI through a normalPUCCH format 3, and the transmission of an SRS in other carriers isdropped. FIG. 18-(b) is the case where a PUSCH is not simultaneouslyallocated to an UL CC configured to transmit an SRS. UE transmits UCIthrough a normal PUCCH format 3, and the transmission of an SRS in othercarriers is dropped.

FIG. 19 is the case where an SRS is given priority over a PUCCH/PUSCH.FIG. 19-(a) is the case where a PUSCH is simultaneously allocated to anUL CC in which an SRS is transmitted. FIG. 19-(b) is the case where aPUSCH is not simultaneously allocated to an UL CC in which an SRS istransmitted. The last SC-FDMA symbol of the SRS subframe of an UL CC #2is allocated for the transmission of the SRS. The PUCCH format 3 of anUL CC #1 is dropped. UCI may be transmitted through the PUSCH accordingto a piggyback scheme.

A bandwidth occupied by an SRS in the last SC-FDMA symbol of the SRSsubframe in FIGS. 17 to 19 may be the entire system bandwidth or may bea narrow band or partial bandwidth. Furthermore, the bandwidth occupiedby the SRS in the last SC-FDMA symbol of the SRS subframe may be aUE-specific SRS bandwidth defined in LTE rel-8/9 and may be an SRSbandwidth newly defined in LTE-A. A bandwidth occupied by a PUSCH in theremaining SC-FDMA symbols is not limited.

The above-described rate matching or puncturing may be selectivelyapplied according to the transmission mode or channel environment ofcorresponding UE and may be implicitly indicated through already definedother parameters or may be indicated by explicitly signaling a newlydefined parameter. Furthermore, the type of PUCCH format used andwhether UCI to be transmitted through a PUCCH is transmitted bypiggybacking to a PUSCH, together with uplink data, or not may beimplicitly indicated through other parameters or may be indicated byexplicitly signaling a newly defined parameter. Here, the indication maybe configured in either a cell-specific or UE-specific manner.

Or, if the SRS transmission band of a plurality of UEs is indicatedthrough a higher layer or signaling so that it is multiplexed within onecarrier, the rate matching or puncturing of the plurality of UEs may beapplied in a cell-specific or carrier-specific manner within at leastcorresponding carrier.

Or, although the SRS transmission band of a plurality of UEs isindicated through a higher layer or signaling so that it is multiplexedwithin one carrier, whether the rate matching or puncturing of a PUSCHwill be applied or not may be explicitly L1/L2 signalized or RRCsignalized in a UE-specific manner.

Meanwhile, in LTE-A, if indication is made by a higher layer, thesimultaneous transmission of a PUSCH and a PUCCH may be supported. Whenthe simultaneous transmission of a PUSCH and a PUCCH is possible, anecessity to maintain a single carrier property is reduced. Accordingly,if an SRS, a PUCCH, and a PUSCH are configured so that they aretransmitted in one subframe, a new data method may be proposed.

For example, all of an SRS, a PUCCH, and a PUSCH may be transmitted inan SRS subframe. As described above, rate matching or puncturing isperformed on a PUSCH in a CC to which an SRS has been allocated and datais transmitted, and a PUSCH is transmitted in a CC to which the SRS hasnot been allocated. Throughput can be increased because a PUSCH isalways transmitted. Reliability of UCI transmission can be guaranteedbecause an SRS and a PUCCH are transmitted at the same time.

Here, if the transmit power of UE exceeds a maximum transmit power in acorresponding SRS subframe or SC-FDMA symbol, an SRS, a PUCCH, and aPUSCH may be transmitted by adjusting the transmit power according tothe priorities of the SRS, the PUCCH, and the PUSCH. The priorities ofthe SRS, the PUCCH, and the PUSCH may be determined in various ways. Forexample, the priority may be in order of PUCCH>SRS>PUSCH. Or, thepriority may be in order of any one of PUCCH>SRS>PUSCH with UCI>PUSCH,PUCCH>PUSCH>SRS, PUCCH>PUSCH with UCI>PUSCH>SRS, and PUCCH>PUSCH withUCI>SRS>PUSCH.

The present invention may be applied by a parameter, indicating thesimultaneous transmission of an SRS, a PUCCH, and a PUSCH, irrespectiveof whether the PUCCH and the PUSCH are transmitted at the same time. Theparameter may be transmitted according to a cell-specific or UE-specificscheme. Furthermore, the parameter may be given by a higher layerthrough a RRC message. If the parameter does not indicate thesimultaneous transmission of an SRS, a PUCCH, and a PUSCH, the methods,such as rate matching or puncturing on a PUSCH, the use of a shortenedPUCCH format, or the drop of an SRS, may be used as described above.

In all the above embodiments, one subframe is assumed to be a normalcyclic prefix (CP) including 14 SC-FDMA symbols, but the presentinvention may also be applied to the case where one subframe is anextended CP including 12 SC-FDMA symbols.

FIG. 20 is an embodiment of the proposed data transmission method. Atstep S100, UE transmits UCI through a PUCCH resource allocated to afirst CC among a plurality of CCs in an SRS subframe. A second CC amongthe plurality of CCs in the SRS subframe includes an SRS SC-FDMA symbolreserved to transmit an SRS.

FIG. 21 is a block diagram of a BS and UE in which the embodiments ofthe present invention are embodied.

The BS 800 includes a processor 810, memory 820, and a Radio Frequency(RF) unit 830. The processor 810 implements the proposed functions,processes and/or methods. The layers of a radio interface protocol maybe implemented by the processor 810. The memory 820 is connected to theprocessor 810, and it stores various pieces of information for drivingthe processor 810. The RF unit 830 is connected to the processor 810,and it transmits and/or receives radio signals.

The UE 900 includes a processor 910, memory 920, and an RF unit 930. TheRF unit 930 is connected to the processor 910, and it transmits UCIthrough a PUCCH resource allocated to a first CC among a plurality ofCCs in an SRS subframe. Here, a second CC among the plurality of CCs inthe SRS subframe may include SRS SC-FDMA symbols reserved for thetransmission of an SRS. The processor 910 implements the proposedfunctions, processes and/or methods. The layers of a radio interfaceprotocol may be implemented by the processor 910. The memory 920 isconnected to the processor 910, and its stores various pieces ofinformation for driving the processor 910.

The processor 910 may include an application-specific integrated circuit(ASIC), another chip set, a logical circuit, and/or a data processingunit. The RF unit 920 may include a baseband circuit for processingradio signals. In software implemented, the aforementioned methods canbe implemented with a module (i.e., process, function, etc.) forperforming the aforementioned functions. The module may be performed bythe processor 910. In view of the exemplary systems described herein,methodologies that may be implemented in accordance with the disclosedsubject matter have been described with reference to several flowdiagrams. While for purposed of simplicity, the methodologies are shownand described as a series of steps or blocks, it is to be understood andappreciated that the claimed subject matter is not limited by the orderof the steps or blocks, as some steps may occur in different orders orconcurrently with other steps from what is depicted and describedherein. Moreover, one skilled in the art would understand that the stepsillustrated in the flow diagram are not exclusive and other steps may beincluded or one or more of the steps in the example flow diagram may bedeleted without affecting the scope and spirit of the presentdisclosure.

What has been described above includes examples of the various aspects.It is, of course, not possible to describe every conceivable combinationof components or methodologies for purposes of describing the variousaspects, but one of ordinary skill in the art may recognize that manyfurther combinations and permutations are possible. Accordingly, thesubject specification is intended to embrace all such alternations,modifications and variations that fall within the spirit and scope ofthe appended claims.

What is claimed is:
 1. A method for transmitting control information bya user equipment (UE) in a wireless communication system, the methodcomprising: receiving, by the UE via a higher layer, a parameter whichindicates whether transmission of a hybrid automatic repeat requestacknowledgement (HARQ-ACK) on a physical uplink control channel (PUCCH)and a sounding reference signal (SRS) in one subframe is configured ornot; when the parameter is true, transmitting, by the UE in a primarycomponent carrier (CC) among a plurality of CCs for carrier aggregation,at least one of the HARQ-ACK and a positive scheduling request (SR) onthe PUCCH, which coincides in a same subframe as the SRS, by using ashortened PUCCH format; and when the parameter is false, transmitting,by the UE in the primary CC, at least one of the HARQ-ACK and thepositive SR on the PUCCH by using a normal PUCCH format, while nottransmitting, in a secondary CC among the plurality of CCs for carrieraggregation, the SRS which coincides in the same subframe as the PUCCH,wherein the shortened PUCCH format is a shortened PUCCH format
 3. 2. Themethod of claim 1, further comprising: when the parameter is true,transmitting, by the UE in the secondary CC among the plurality of CCsfor carrier aggregation, the SRS in the same subframe.
 3. The method ofclaim 1, wherein, when the parameter is true, the PUCCH is transmittedin cell specific SRS subframes of the primary CC.
 4. The method of claim1, wherein the same subframe is one of a plurality of UE-specificsubframes configured by a UE-specific parameter.
 5. The method of claim4, wherein the UE-specific parameter indicates a periodicity and offsetof the plurality of UE-specific subframes.
 6. The method of claim 4,wherein the plurality of UE-specific subframes is a subset of aplurality of cell-specific subframes configured by a cell-specificparameter.
 7. The method of claim 1, wherein a bandwidth of part of oran entire single carrier frequency division multiple access (SC-FDMA)symbol is allocated to the transmission of the same subframe.
 8. A userequipment (UE) in a wireless communication system, the UE comprising: amemory; a radio frequency (RF) unit; and a processor that is coupled tothe memory and the RF unit, and that: controls the RF unit to receive,via a higher layer, a parameter which indicates whether transmission ofa hybrid automatic repeat request acknowledgement (HARQ-ACK) on aphysical uplink control channel (PUCCH) and a sounding reference signal(SRS) in one subframe is configured or not, when the parameter is true,controls the RF unit to transmit, in a primary component carrier (CC)among a plurality of CCs for carrier aggregation, at least one of theHARQ-ACK and a positive scheduling request (SR) on the PUCCH, whichcoincides in a same subframe as the SRS, by using a shortened PUCCH, andwhen the parameter is false, controls the RF unit to transmit, in theprimary CC, at least one of the HARQ-ACK and the positive SR on thePUCCH by using a normal PUCCH format, while not transmitting, in asecondary CC among the plurality of CCs for carrier aggregation, the SRSwhich coincides in the same subframe as the PUCCH, wherein the shortenedPUCCH format is a shortened PUCCH format
 3. 9. The UE of claim 8,wherein, when the parameter is true, the processor further controls theRF unit to transmit, in the secondary CC among the plurality of CCs forcarrier aggregation, the SRS in the same subframe.
 10. The UE of claim9, wherein, when the parameter is true, the PUCCH is transmitted in cellspecific SRS subframes of the primary CC when the parameter is true. 11.The UE of claim 8, wherein the same subframe is one of a plurality ofUE-specific subframes configured by a UE-specific parameter.
 12. The UEof claim 11, wherein the UE-specific parameter indicates a periodicityand offset of the plurality of UE-specific subframes.
 13. The UE ofclaim 11, wherein the plurality of UE-specific subframes is a subset ofa plurality of cell-specific subframes configured by a cell-specificparameter.
 14. The UE of claim 8, wherein a bandwidth of part of or anentire single carrier frequency division multiple access (SC-FDMA)symbol is allocated to the transmission of the same subframe.